Real Time Text (RTT)
Type back and forth in real time with the other person while on a call.
You can use RTT whenever you are calling someone whose phone also supports RTT or is connected
to a teletypewriter (TTY) device. The RTT icon appears on all incoming RTT calls.
From Phone, tap More
Tap Real time text for the following options:
RTT call button: Choose a visibility option for the RTT call button.
Use external TTY keyboard: Hide the RTT keyboard when an external TTY
keyboard is connected.
TTY mode: Choose the preferred TTY mode for the keyboard in use.
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